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Light dark photon and fermionic dark radiation for the Hubble constant and the structure formation
2016
Physics Letters B
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Motivated by the tensions in the Hubble constant H_0 and the structure growth σ_8 between Planck results and other low redshift measurements, we discuss some cosmological effects of a dark sector model in which dark matter (DM) interacts with fermionic dark radiation (DR) through a light gauge boson (dark photon). Such kind of models are very generic in particle physics with a dark sector with dark gauge symmetries. The effective number of neutrinos is increased by δ N_eff∼ 0.5 due to light
doi:10.1016/j.physletb.2016.10.001
fatcat:lpbghbt7j5bofgixc6l5sfvivy